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首页> 外文期刊>Australasian Plant Pathology >Effect of root and foliar applications of silicon on brown spot development in rice
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Effect of root and foliar applications of silicon on brown spot development in rice

机译：硅根和叶面施用对水稻褐斑形成的影响

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Silicon (Si) application is a strategy to manage rice brown spot, but no studies have been conducted on Si as a foliar spray for control of this disease. The purpose of this study was to compare root and foliar Si applications on rice brown spot development, and to determine if there is a biochemical defence response. Rice plants (cv. Metica-1) were grown in a Si-deficient soil that received the following treatments: root application of calcium silicate (CS) (1.25 g/kg of soil), foliar applicationof potassium silicate (PS) (40 g/L), and control (leaves sprayed with distilled water). Thirty-day-old plants were inoculated with a conidial suspension of Bipolaris oryzae. Si concentration in rice tissue was markedly higher for CS compared with the other treatments. The intensity of Si deposition, as determined by X-ray microanalysis, between the adaxial and abaxial leaf blades of rice plants in the control treatment was similar. Si deposition occurred in both the adaxial and abaxial leaf blades of rice plants that received CS while this Si deposition only occurred on the adaxial leaf blades of plants that received PS. The area under brown spot progress curve (AUBSPC) was not significantly different between the PS and control treatments, but was significantly lower in plants grown in soil amended with CS. The values for the AUBSPC and the number of lesions (NL) per cm(2) of leaf area decreased by 37 and 47%, respectively, with CS compared with the control. Conidial germination was not inhibited by PS. The concentration of total soluble phenolics and lignin-thioglycolic acid derivatives was not linked with the reduction observed in the AUBSPC and the NL. Although the concentration of these two biochemical variables seemed to be slightly higher in plants from the control treatment, likely due to the greater disease severity and the NL, rice tissue was not efficiently protected against colonisation by B. oryzae. The results of this study suggest that foliar-applied Si can decrease the intensity of brown spot; however, the level of control achieved was not as great as that obtained when Si was supplied to the roots.
机译：施用硅（Si）是管理水稻褐斑的一种策略，但是尚未对作为叶面喷洒剂的Si进行控制该病的研究。这项研究的目的是比较根和叶面施硅对水稻褐斑发育的影响，并确定是否存在生化防御反应。水稻植株（Cetic。Metica-1）在缺乏硅的土壤上生长，该土壤经过以下处理：硅酸钙（CS）的根部施用（1.25 g / kg土壤），硅酸钾（PS）的叶面施用（40 g / L），并进行控制（叶喷有蒸馏水）。将30天大的植物用米生双极孢子的分生孢子悬浮液接种。与其他处理相比，CS中水稻组织中的Si浓度显着更高。通过X射线显微分析测定，在对照处理中，水稻植株的正反叶片之间的硅沉积强度是相似的。硅沉积发生在接受CS的水稻植株的正反叶片上，而硅沉积仅发生在接受PS的植株的正反叶片上。 PS处理和对照处理之间的褐斑进展曲线下面积（AUBSPC）并无显着差异，但在用CS改良的土壤中生长的植物中其显着较低。与对照相比，CS的AUBSPC值和每厘米叶面积（2）的病斑数（NL）分别降低了37％和47％。分生孢子萌发不受PS抑制。总可溶性酚和木质素-巯基乙酸衍生物的浓度与在AUBSPC和NL中观察到的减少没有关系。尽管这两个生化变量的浓度似乎比对照处理的植物高一些，这可能是由于病害严重程度和NL较高所致，但稻米组织并不能有效地保护其免受米曲霉的定植。研究结果表明，叶面喷施的硅可以降低褐斑的强度。然而，获得的控制水平不如将Si供应到根部时获得的控制水平高。

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